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【单选题】
某二元弱酸 H 2 A 的 K a1 =6.0×10 -8 , K a2 =8.0×10 -14 ,浓度为 0.05mol·L -1 的该溶液中 A 2- 的浓度约为( ) mol·L -1A.
6×10 -8
B.
8×10 -14
C.
3×10 -8
D.
4×10 -14
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